I'll copy and paste what I said in the Europe thread here, since this thread is all about Rebirth:
There is almost no doubt in my mind at this point that Square Enix is disappointed with Final Fantasy VII Rebirth's performance.
Sales of Final Fantasy 16 did not meet Square Enix's high expectations, said president Takashi Kiryu.
www.eurogamer.net
Final Fantasy XVI met the low end of their expectations, and the SE president,Takashi Kiryu, blamed the performance on the slow adoption rate of the PS5. It appears Rebirth has fallen behind XVI. Rebirth did not receive the budget it did with the expectation that it would fall behind XVI after the PS5 had further grown its install base, even having gone through a holiday, since XVI's release. SE had their PR ready a week after XVI's release to praise its 3million sales performance. They would not be silent on Rebirth if things were looking pretty. The game must've missed its internal projections.
When you consider Europe is not that big a market, and Japan isn't showing good numbers for the game, and NPD had TEKKEN 8 (2 million first month debut, PR from Bandai Namco) ahead of FF7 Rebirth for the year 24' ending mid way through the first week of March for North America:
https://wccftech.com/helldivers-2-beat-final-fantasy-vii-rebirth-npd-circana-february-2024/ it puts more shade on the game's 'success'.
Here is Final Fantasy VII Remake's debut performance for reference:
https://www.destructoid.com/final-fantasy-vii-remake-launch-month-sets-new-franchise-sales-record/
If Zhuge is right and it's selling half of Remake's numbers, with a weaker tail, FF7 remake did 7 million by September 2020. Rebirth would be on track to hit 3.5 million-4 million in a similar time frame. Sounds too low to be true, but yeah, for this game that's not good at all.
Square Enix will verbalize how they feel about this game's performance soon enough.